Tag Archives: Environmental Protection Agency

Spartan Mosquito Eradicator

Scientists conclude Spartan Mosquito Eradicators don’t work

Research conducted in Florida found no evidence that Spartan Mosquito Eradicatiors are effective mosquito-control devices. Below is my reconstruction of the two experiments they conducted. One was in the laboratory, one was outside.

Laboratory experiment

Below is a rough reconstruction of the laboratory experiment they conducted. In each of the cages (BugDorm-2120), 100 male and 100 female tiger mosquitoes (Aedes albopictus) were released, then monitored for mortality at 24, 48, and 72 hours.

Schematic of laboratory experiment based on description in Aryaprema et al. 2020.

Here is a photograph of one of the choice cages:

Below are the cumulative mortality data for the three cages. The Spartan Mosquito Eradicator filled with the provided packet ingredients (treatment) did not result in higher mortality. I.e., there was no evidence the device killed mosquitoes under laboratory conditions.

Field experiment

The researchers also conducted a field experiment using two sites that had large populations of tiger mosquitoes (because of the presence of tires). At each site they deployed five tubes (separated by 4 m), switching whether the tubes were “treatment” or “control” tubes every 2 weeks. A BG-Sentinel trap (without carbon dioxide) was used to quantify mosquito numbers every week.

Schematic of field experiment based on description in Aryaprema et al. 2020.

Below are the weekly numbers of mosquitoes caught in the BG Sentinel traps. Results: there was no evidence that presence of treatment tubes (filled as per company guidelines) reduced the numbers of mosquitoes at the sites.


The scientists concluded that “Both laboratory and field components of our study show that the Spartan Mosquito Eradicator is not effective in reducing abundance of Ae. albopictus.” They speculate that the contents do not attract mosquitoes and that the holes on the device (~3 mm) are too small for mosquitoes to easily reach the fluid inside. They also highlight the need for an experiment to evaluate whether the active ingredient (1% sodium chloride) kills adult mosquitoes. I.e., even if mosquitoes were attracted to Spartan Mosquito Eradicators and could easily get inside, the salt might not be lethal.

Aryaprema, V.S., E. Zeszutko, C. Cunningham, E.I.M. Khater, and R.-D. Xue. 2020. Efficacy of commercial toxic sugar bait station (ATSB) against Aedes albopictus. J. Florida Mosquito Control Association 67: 80-83. PDF

Update: the salt experiment has been conducted. And the result is that salt does not kill mosquitoes.

All of these results are no surprise to anyone. Please see my 2019 review of the Spartan Mosquito Eradicator for details. I also reviewed the Spartan Mosquito Pro Tech, the company’s newest tube. It is just as effective.

Spartan Mosquito Pro Tech review

This post is a review of the Spartan Mosquito Pro Tech, a tube containing sugar, yeast, and boric acid that you fill with warm water and then hang in your yard from trees. The manufacturer says it “kills mosquitoes that may carry West Nile Virus, Zika Virus, Dengue Fever, St. Louis encephalitis, Western equine encephalitis, and Eastern equine encephalitis for up to 30 days”. Each box of two tubes costs approximately $25. It is different from the Spartan Mosquito Eradicator, which lists salt as the active ingredient.

How the device is supposed to kill mosquitoes

Once you add water, directions say to hang tubes at a density of four per acre around the perimeter of your property, away from where people gather. The cap has a series of small holes (approximately 5/32″) that are supposed to accommodate mosquitoes.

Below is the sequence of events that are supposed to happen.

  1. mosquitoes are attracted to the tubes
  2. mosquitoes land on the tubes
  3. mosquitoes crawl around until they find the holes in the cap
  4. mosquitoes squeeze though the holes
  5. mosquitoes walk down sides of tube toward liquid
  6. mosquitoes ingest some of the liquid (which contains boric acid)
  7. mosquitoes walk back up sides of tube
  8. mosquitoes find holes
  9. mosquitoes squeeze through holes
  10. mosquitoes fly away
  11. mosquitoes die from boric acid ingested in step 6

Does it work?

No. I tested four in my yard in Pennsylvania and there was no noticeable drop in the numbers of mosquitoes biting me. I also looked inside all of the tubes and didn’t see a single mosquito. And I never observed a single mosquito near any of the tubes, despite a phrase on the package that says, “mosquitoes will gather” around them.

In addition to the above observations I used a home security camera to spy on one tube continuously for over a week, to see whether mosquitoes might be showing up when I’m not watching (e.g., at night). Here are the details of what I did (photographs of setup are below). The camera didn’t record the presence of a single mosquito. I concluded that the Spartan Mosquito Pro Tech is not capable of killing mosquitoes outdoors because mosquitoes are not even attracted to it. I.e., it fails at step 1, above.

Why doesn’t the Pro Tech attract mosquitoes?

Based on what the inventors have said publicly, the carbon dioxide produced by the yeast fools the mosquitoes into believing there’s an animal inside the tube.

I think this scenario is implausible. Although it is certainly true that mosquitoes use carbon dioxide to find hosts, I doubt the yeast is making enough carbon dioxide to attract mosquitos. And certainly not for an entire month. Indeed, I find the company’s explanation so implausible I cannot bring myself to think they believe it themselves.

How did the Pro Tech get an EPA registration?

Because the Spartan Mosquito Pro Tech has an EPA registration number (93813-1), the company must have submitted data showing the device can kill mosquitoes. But if the device doesn’t attract mosquitoes, how is this possible?

One explanation might be that Spartan Mosquito supplied data from experiments using caged mosquitoes. I learned about this option after asking the EPA whether Spartan Mosquito’s data were truly from outdoor experiments — the EPA answered by referring me to a web page that contained this line: “When appropriate, laboratory colony or caged wild mosquitoes can be used.” I also noticed that Spartan Mosquito stated on its Facebook page that field trial (outdoor) data are not required to secure an EPA registration:

Therefore, it seems likely that the EPA granted a registration on cage data only. In this scenario, a known number of mosquitoes would be released inside a sealed container that had a Spartan Mosquito Pro Tech, and their survival over time would be compared to that inside a control cage.

There are numerous problems with testing attractive toxic sugar baits (ATSBs) in cages. The most obvious is that there are no alternative sugar or water sources for mosquitoes and thus the test doesn’t measure, at all, how attractive the device might be in the real world (consumers’ yards).

Another major problem is that Spartan Mosquito sets up experiments in way that biases the outcomes. This can be illustrated by evaluating an experiment involving the Spartan Mosquito Eradicator they posted about on Facebook:

On the bottom left of the video there’s a view of the “Product” treatment — this tube is presumably filled with sugar, yeast, water, and salt (the listed active ingredient). The tube on the right shows the “Control” treatment, presumably filled with only sugar, yeast, and water (but no salt). However, the Eradicator in the “Control” cage doesn’t have a cap. The absence of a cap means that mosquitoes in search of water and sugar can easily get both simply by crawling into the tube. I.e., the experiment was designed in a way to easily ensure that mosquitoes in the “Control” tank lived longer than those in the “Product” tank.

The video also reveals another strategy of Spartan Mosquito, that of implying that all 378 mosquitoes that died in the “Product” cage died because they entered the tube, ingested some fluid, then died. You can see part of this pile of dead mosquitoes at the bottom of the screen grab below (left).

There’s zero evidence in the video that any of those mosquitoes ingested the fluid inside the tube. All that’s presented in the video is a compilation of 3 or 4 clips showing individual mosquitoes entering or exiting the tubes. The screen grab below shows one of these instances along with the suggestive phrase, “Mosquitoes enter Spartan Mosquito Eradicators to feed on the solution inside.”

What’s important to notice here is that the company did not include a compilation of hundreds of clips showing mosquitoes going into the tube. If Spartan Mosquito had these clips I’m positive they would have used them. Plus the video doesn’t show a single mosquito exiting with a distended abdomen, which would easily show that a mosquito had ingested fluid. My conclusion is that all the mosquitoes piled up on the bottom of the “Product” cage died from some other cause. The most likely explanation is simple dehyradation. Regardless, it certainly had nothing to do with mosquitoes going inside and drinking saltwater, because scientists have showed that the saltwater in Spartan Mosquito Eradicators is not lethal to mosquitoes.

The experiment I’ve critiqued above concerns a “minimum risk” pesticide, of course, and I acknowledge that Spartan Mosquito may not have needed to be particularly careful in how it set up and analyzed experiments (many states don’t even require proof that such devices work). However, it seems possible that the company adopted some of the same strategies when designing experiments for the Spartan Mosquito Pro Tech. And it seems possible the company might represent the outcomes to the EPA in the same way, persuading regulators that the deaths in the “Product” treatment were from mosquitoes going inside the tubes and then drinking the toxic fluid, when in reality there’s no evidence of this happening.

It’s probably worth mentioning that Spartan Mosquito is being sued for false advertising and that over a dozen states (CA, CT, ID, IN, KS, MD, ME, MT, NE, NM, NV, NY, OK, PA, SD, UT, VA, WA, DC, and PR) have prohibited sales of the Eradicator. And California has denied a registration to the Pro Tech. The company is also being sued for breach of contract, fraud, and trademark infringement by several other companies.

The backstory

Given all of the above, I was not surprised to eventually discover that the EPA registration decision was not just based on efficacy data. Instead, Spartan Mosquito apparently convinced the EPA that the device should be fast-tracked. I first learned of this from a radio segment featuring Jeremy Hirsch (the inventor, founder, and current chairman of the board). During the interview the host said, “Hirsch is attempting to get an early green-light because mosquitoes are so dangerous”.

How, exactly, does one persuade the EPA that a pesticide should be rushed through the registration process? It turns out that Spartan Mosquito hired a lobbying firm (Gunster Strategies Worldwide) to get this done. Below is a document (now deleted) that I found on Gunster Strategies’ website. The scheme is spelled out in astonishing detail:

Gunster Strategies' plan to push through Spartan Mosquito Pro Tech registration process at the Environmental Protection Agency

In regard to the op-eds mentioned in the document, it appears that an influential health official in Togo (Dr Tinah) was one of the writers, though it came in the form of a press release. It would be interesting to know who actually wrote that press release and also whether Dr Tinah was paid in some way.

I’m still trying to figure out who the firm payed to write letters to EPA officials. I would also like to know which administrators at the EPA were targeted.

Although not mentioned in the strategy document, Spartan Mosquito and one of its founders (Jeremy Hirsch) gave approximately $10,000 to the Cindy Hyde-Smith, the senator who chairs the committee with EPA oversight. I don’t think they donated to any other senator. It would be interesting to know whether Senator Hyde-Smith was one of the persons who called or wrote EPA officials about the Pro Tech.

I’m not sure how it fits into categories listed above, but it’s possible that two companies (see below) were created for the sole purpose of influencing the Pro Tech’s registration process at the EPA. Both companies claimed to be non-profits that highlighted their goal of helping people in dire need. But they were both singularly interested in promoting Spartan Mosquito. So my guess is they were involved somehow in the scheme.

1. Innovative Mosquito Control, Inc

Innovative Mosquito Control (INMOCO) purports to be a public benefit corporation devoted to fighting malaria in Africa. As part of this effort it claims to have partnered with Spartan Mosquito to promote/supply the company’s tubes to the region. Its CEO and President is Omar Arouna (2nd from left in photograph below), a lobbyist based in D.C. who typically charges $1,500/hr for consulting and social media campaigns. There’s no further information on who works at the company or whether it even has employees. Contributing to the lack of information is that fact that the business was set up in Delaware, a state popular among companies that want to keep the true owner secret. And the company’s website was housed on a server in the U.S. Virgin Islands, also famous for companies that want to obscure their operations. It all seems needlessly secretive for a company that is ostensibly fighting malaria. But here’s the interesting part: Mr Arouna has worked with Gunster Strategies on several occasions. And as a minor fact, both INMOCO and Gunster Strategies use Wix for websites. It seems likely that they collaborated here, too.

Dr. Atcha-Oubou Tinah, MD-MPH (Coordinator of the Togolese National Malaria Control Program), Omar Arouna (President and CEO Innovative Mosquito Control Incorporated, Dr Moustafa Mijiyawa (Togolese Minister of Health and Public Hygiene, Chair of the Africa CDC Governing Board), & Jeremy Hirsch (Founder and Chairman of the Board, Spartan Mosquito).

What’s also interesting is that soon after the Pro Tech got its registration from the EPA, INMOCO’s website was taken down and its Facebook page (which has zero followers) has had no further posts. And Mr Arouna’s LinkedIn profile is devoid of any mention of this endeavor. It’s as if the whole operation was created just to give the illusion that Spartan Mosquito was going to rid the world of malaria, a fact that could be used to manipulate reviewers at the EPA.

2. West Nile Education, Eradication & Prevention

WEEP & Recover, a Mississippi non-profit, was also set up two days before the EPA’s consideration of the Pro Tech. It’s run by James Hendry, probably most famous for his other non-profit, Mississippi for Family Values. The WEEP & Recover website and Facebook page are full of slick graphics and videos, most of which feature Spartan Mosquito and, notably, never mention any other mosquito-control company.

Functionally, WEEP & Recover is an advertising arm of Spartan Mosquito. The videos, graphics, and website design are all provided by the branding firm, Unify by Bread. Unify by Bread also produced a heartwarming video about hardware store staff that used Spartan Mosquito products as backdrops. My guess is that all of this was funded by Spartan Mosquito, perhaps channeled through Gunster Strategies.

In summary, it appears the EPA was played.


The EPA says it will not reevaluate the Pro Tech’s registration until 2035, but state lead agencies (SLAs) retain the legal right to require a pesticide company to make label changes to comply with individual state laws, as long as those recommendations are already covered under FIFRA. And any state can require a company to provide additional experimental data for any reason. Regulators can also just share their concerns with the staff at the EPA who are in charge of enforcement. Given these avenues, below are my suggestions for how states might help the average consumer better understand the Pro Tech’s abilities to kill mosquitoes:

  1. Require Spartan Mosquito to clarify on its website and packaging that the device has been shown to kill mosquitoes in cages only. The current packaging, instruction manuals, and website use words such as “outdoors”, “yard”, “backyard”, and “property” to imply to consumers that the device kills mosquitoes outside, which as far as I know the company has not demonstrated. If asking for this change outright seems unreasonable, a state regulatory agency could, I think, request that Spartan Mosquito supply the experimental data that supports its implied claim about outdoor efficacy. States can ask Spartan Mosquito for details on the experimental design, too — it should have a control, be replicated, be double-blinded, and be done by a qualified person who is not employed by or otherwise affiliated with the company (this is the standard that many states have for “minimum risk” pesticides, so I think it’s reasonable for one that claims to protect human health).
  2. Require Spartan Mosquito to omit or change the phrase, “mosquitoes will gather around the tubes”, that is currently printed on the package label in several locations. As currently worded it is an efficacy claim. Again, states could request that Spartan Mosquito supply the supporting data that show mosquitoes gather around the devices when they are placed in yards. As per above, the experiment should be well described and not conducted by the company itself, or by board members of the company, who still have a financial stake in the outcomes. In lieu of quantitative data from controlled, replicated, double-blinded experiments, states might instead ask for a photograph showing mosquitoes gathered around a Pro Tech that is deployed outdoors. If the claim is true the data and/or photograph should be easy to supply.
  3. Require Spartan Mosquito to add wording to packaging and website to clarify that the Pro Tech will not completely eliminate mosquitoes. The EPA has already directed the company to include such wording. The addition seems needed because its previous product, the Spartan Mosquito Eradicator, is advertised to kill up to 95% of mosquitoes. Consumers who have used Spartan Mosquito Eradicators for years might thus assume that the Pro Tech has the same level of efficacy, if not higher. Company has not yet made the change.
  4. Require company to clarify what the sugar and yeast are for. If they are active in some way (e.g., to attract mosquitoes to the tube) they should be listed as active ingredients. Also, the yeast will consume the sugar and produce ethanol and carbon dioxide, both of which can be lethal to mosquitoes. If sugar and yeast are truly inert then require company to omit them and use just water.
  5. Require company to remove or change the testimonials on its website. Currently the company features nine testimonials from people discussing the Spartan Mosquito Eradicator, a different pesticide product. I.e., given the date when these testimonials were posted on the company’s Facebook page, the people would not yet have had the opportunity to test the Pro Tech for the season. Company should be encouraged to use testimonials in which the consumer has either specified “Pro Tech” or mentions boric acid in some way.
  6. Require company to remove the phrases, “attractive toxic sugar bait“, and, “slow release device“, from its website. The “attractive toxic sugar bait” implies outdoor efficacy (i.e., tube will successfully compete with natural sources of sugar to attract mosquitoes) and the “slow release” suggests that the boric acid gradually activates over a month (untrue, as far as I know). Company regularly uses these phrases in response to customer queries on its Facebook page. Regardless of company’s intent, neither phrase is mentioned in the EPA registration and are therefore off-label claims.
  7. Require Spartan Mosquito to change the product name. EPA guidelines expressly prohibit the use of any brand name that implies heightened efficacy. The phrase “Pro Tech” is shorthand for “professional technology” and thus does not comply with FIFRA.
  8. Prohibit company from using the device’s alternate brand name, “Spartan Mosquito Eradicator Pro Tech”. The reasoning behind this suggestion is that the EPA specifically prohibits the use of the word “Eradicator” in brand names.

The challenge, of course, is to get states interested in the above, and I’m sensing that some are not aware that states are allowed to (and should) give attention to how EPA-registered pesticides are marketed. I’m hoping that once the class-action suit against Spartan Mosquito starts to get national coverage, pesticide-registration staff will find it easier to embrace enforcement actions. Indeed, most states still allow sales of the Spartan Mosquito Eradicator even though it doesn’t contain an ingredient that kills mosquitoes.

Another likely source of hesitation is the presence of a senator from Mississippi, Cindy Hyde-Smith, on several committees with jurisdiction over the EPA. (Spartan Mosquito has given her money.) I.e., few people want to go after a prominent Mississippi pesticide company right now. This probably also explains why the American Mosquito Control Association (currently lobbying for money, legislation) has remained publicly silent on Spartan Mosquito’s tubes despite extensive internal communications about the device.


If you have information on the Spartan Mosquito Pro Tech that I’ve missed, send me a message or leave a comment on this post.

Effects of mosquito sprays on humans, pets, and wildlife

Mosquito Authority, Mosquito Joe, Mosquito Platoon, Mosquito Shield, Mosquito Squad, TruGreen, and many other companies often imply that the insecticides they spray on yards are safe for everything except mosquitoes. These companies are also very reluctant to reveal what chemicals they use. This page contains information on what, exactly, they spray and what effects those chemicals have.

After a little digging, I think I’ve uncovered most of the active ingredients used by these companies:

Please email me if you think I’ve made an error or if you know that a formulation has changed (which happens). All of the chemicals are either pyrethrins or pyrethroids, which are natural and synthetic (respectively) neurotoxins that cause almost instant paralysis and death to mosquitoes. Below is the chemical structure for one, permethrin:

Are these chemicals safe for humans?

Pyrethroids are relatively safe but should not be viewed as harmless. If you spill enough on your skin you might experience itchiness, numbness, nausea, and respiratory problems, among a rather long list of adverse events. Although you obviously can’t test whether pyrethroids harm human brains, studies on mice and rats suggest that the chemicals do act on mammalian nervous systems; that should at least give you pause if you have kids rolling around on the grass after the yard gets dosed. Indeed, there is at least one correlational study that suggests exposure to pyrethroids is not good for kids (or at least boys). There are also scattered reports that some pyrethroids are carcinogenic and estrogenic but I don’t think such effects are shockingly large, and to date they seem to be restricted to mouse studies. At very high doses pyrethroids can kill you, a fact known because some people have injected it (suicide) and in one case because somebody ate food that was cooked in pyrethroid concentrate (it resembles cooking oil).

Are pyrethroids safe for pets?

Dogs and chickens seem to be fine. Cats, however, lack sufficient levels of a liver enzyme that helps detoxify pyrethroids and can thus develop what is called pyrethroid toxicosis. A good indicator of cat sensitivity to pyrethroids is the standard warning of keeping cats away from pyrethroid-treated dogs. I.e., if you dose your dog with a large amount of pyrethroids (to kill fleas, e.g.), cats that cuddle with the dog are at risk. If you’d like to see a video of rag doll cat with pyrethroid poisoning (you probably don’t), here’s a video.

Do pyrethroids kill other animals? 


For example, the spray kills monarch caterpillars, even weeks later later due to the presence of insecticide dried onto milkweed leaves (Oberhuaser et al. 2006).

And the spray can kill honey bees, even if honey bees are inside their hives when the pyrethroids are spayed (workers bring small amounts back to the hive the following day if they land on treated plants or if they find small puddles of water to drink). Sublethal amounts of pyrethroids can change honey bee behavior and make workers smaller. I would imagine the pyrethroids would end up in the honey, too.

And pyrethroids kill fireflies, which are most active in a yard in the late evening when mosquito-spraying franchises like to fog.

My favorite group of unnoticed insects that are killed by evening pyrethroid applications are solitary bees, of which there are approximately 4,000 species in the United States. These are bees that collect pollen and nectar during the day but spend their evenings and nights in holes (e.g., mason bees) or clamped to low vegetation. E.g., look at this a two-spotted long-horned bee (Melissodes bimaculatus) from my front yard this summer. Everyone has dozens of species of native bees in their yards but few people realize it. So when pesticide applicators claim their pyrethroid sprays “don’t harm bees” or are “bee friendly”, that is entirely untrue. It’s simply a marketing slogan they were taught when they bought the franchise, and they will insist it’s true even when presented with evidence to the contrary.

Anyone using a spraying service is, therefore, killing all of the above and more. Insects are small and easy to ignore, but if you were to go out after a spraying and look very carefully, you’d find thousands of dead insects on the ground. And only an extremely small percentage would be mosquitoes.

Pyrethroids can kill ALL arthropods, in fact, not just insects. So if a yard is sprayed, likely you’d likely find dead spiders, mites, centipedes, and millipedes.

One obvious consequence of gassing all the arthropods in a yard is that bird species that eat arthropods will have a lot less to eat. Population levels of swallows and flycatchers, for example, have dropped in last several decades and one explanation is that there are fewer insects to eat.

And then there are fish, which are acutely sensitive to pyrethroids. Franchise owners will generally avoid spraying near people’s fish ponds and bodies of water. Indeed, by law pyrethroids can’t be used near water, though there are many reports of franchises ignoring that regulation. Even if a property doesn’t have a pond or stream, pyrethroids are rather stable in the soil and tend to get washed into nearby streams after rains. It is increasingly accepted that runoff of pyrethroids into creeks can kill fish downstream.

Finally, pyrethroids are toxic to certain earthworms. This is probably especially true for those species that come out onto lawn surfaces in the evening, when pyrethroids are often applied. To be honest, many people don’t really care about earthworms (some hate them) but for people who love aerated lawns it should be pointed out that fogging with pyrethroids might result in less aeration. And, perhaps, result in robins that wonder where all the worms have gone.

Note that people who spray their yards with pyrethroids will still have butterflies, fireflies, etc. They just won’t have as many, and likely the some of the ones they do see are from the neighbors’ yards. And people who have their yards sprayed with pesticides invariably won’t perceive the drop in wildlife numbers and will likely truly believe that the sprays are harmless to everything but mosquitoes. Confirmation bias is a fundamental part of human nature. And, of course, everyone believes they are immune to confirmation bias.

Do pyrethroids affect plants?

As you might expect, plants that depend on pollinators are likely to have reduced seed production if dosed with an insecticide. E.g., Brittany Harris found reduced reproductive success of rare plants in Florida when they were located near houses sprayed with insecticide. Pyrethroids can also harm plants directly (e.g., Tu 1981, Bragança et al. 2018).

Pyrethoids are engineered to last for weeks

As mentioned above, pyrethroids adhere to plant surfaces and stay chemically active for weeks, so the risk to all the organisms mentioned above can last for weeks. Here’s a a description of pyrethroid persistence that I found on a Mosquito Squad FAQ:

“How can the barrier spray continue to kill mosquitoes for 21 days? Mosquitoes will feed on plant juices. When they attempt to feed on sprayed leaves, the residual from the spray will kill them.

Mosquitoes don’t eat leaves, of course, but the quote is correct about the fate of insects that walk on treated leaves. Pesticide franchises like to claim that once their product is dry it is no longer toxic, but that claim makes no logical sense in light of their claim that the product provides protection for three weeks. Some pyrethroids can even last for 90 days if they are on shaded surfaces.

Signage and notification requirements

There doesn’t seem to be a Federal law requiring either signage or neighbor notification when a yard is sprayed with insecticide, and state laws are variable (here’s a good review; here’s another). Many states have laws that require applicators to leave signs at properties that have been sprayed, and some require notification of neighbors prior to spraying. For example, most counties in New York require that neighbors be notified 48 hours before spraying (details). That’s also an option for beekeepers in some states, too; in that case the pesticide applicators need to search a database of hives in a town, then notify hive owners when spraying will happen.

I live in Pennsylvania, one of several states that allows people to be placed on a Pesticide Hypersensitivity Registry. Once on it, pesticide applicators will know you have a medical issue with pesticides and they are obliged to inform you of future spraying (so you can leave the area).

If you want to know what rules might apply in your state, Googling “pesticide notification laws regulations residential pennsylvania” (replace with your state) will get you started. If that doesn’t help just contact your state agency that regulates pesticide use. Towns and cities will sometimes have their own rules but some states prohibit such rules.

How local governments can help

All towns and cities should maintain a web page that provides mosquito information and relevant pesticide laws to residents. Towns can also enact ordinances on third-party pesticide applications. For example, a town might require that franchises alert neighbors 48 hours before spraying is done.

State governments can also make sure that pesticide franchises are not making false claims. E.g., if companies claim through words or imagery that their pyrethroid-containing sprays are “environmentally friendly,” “bee friendly,” “kid friendly,” “pet friendly,” or government approved (e.g., “EPA-approved”), sue them. Massachusetts did, and now has several restrictions on advertising including a ban on ads that “rely on images of young children to convey a sense of harmlessness“. Almost all sites I’ve looked at have misleading wording, especially the claim that pyrethroid-containing sprays “target” mosquitoes and ticks (completely false; they do no such thing). 

Is spraying effective?

Although spraying pyrethroids might be a good way to kill mosquitoes near the ground and in low shrubs, many mosquito species spend most of their time high up in the canopies of trees and are untouched by sprays. For example, many species in the genus Culex (transmitters of West Nile virus, St. Louis encephalitis, eastern equine encephalitis, western encephalitis, avian malaria, etc.) are tree dwellers and only occasionally come down to feed on humans and pets. This limitation isn’t just theoretical: one study showed spraying didn’t reduce numbers of Culex at all. So if you have trees and birds, don’t expect that spraying will be effective.

But I don’t want to imply that spraying is completely ineffective. Pyrethroid fogs will probably kill a large percentage of Anopheles spp. (vectors of malaria) and Aedes spp. (vectors of dengue, yellow fever, Zika, etc.) because these species are more likely to be lower in the vegetation.

Do garlic sprays work?

Many pest-control companies offer a garlic-based spray, too. I haven’t been able to find any scientific publication on these sprays. They might work. But they might also just cater to people’s hopes. Ask the company for printed efficacy data and pass if all they give are testimonials and promises. If you know of a peer-reviewed article showing that garlic spray kills and/or repels mosquitoes, please contact me and I’ll include here.

Automatic fogging systems

For about $4,000, some companies will install systems that dispense pyrethroids over your yard at regular intervals. Don’t do this. Just don’t.

Alternatives to spraying

Here are my tips.